Valve-gear



(No Model.)

G. W. WRIGHT.

VALVE GEAR.

No. 551,024. Patented Dec. 10, 1895.

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. UNIT D STATES PATENT OFFICE.

enonon w. wRIGHn'oF LAPEL, INDIANA.

VALVE-G EAR.

SPECIFICATION forming part of Letters Patent No. 551,024, dated December 10, 1895.

/ Application filedMarch 21,1895. Serial No. 642,634; (No model.)

\ rangement of parts of valve-gears for engines whereby inexpensiveness of construction and 'efiiciency and promptness of operation are secured, as will be hereinafter more particularly described and claimed.

Referring to'the accomp'anymg drawings,

which are made a part hereof, and on which similar letters of reference indicate similar parts, Figure 1 is a View, partly in siderele- 'ation and partly in central vertical section, ofa steam-pump provided with a valve-gear embodying my said invention; and Fig. 2 is a transverse sectional view thereof as seen when looking "in the direction indicated by the arrows from the dotted line 2 2 in Fig. 1. In said drawings the portions marked A represent the steam-cylinderof the pump;

1 the pumping-cylinder O, the steam-valve, I), the valve-rod; E, a pivoted lever by which said valve-rod is partially operated, and F a spring carrying a cam by which the remainder of the operation is effected.

The two cylinders A and B are connected by frame-bars B, and the pistons are connected by a piston-rod A in-a usual and wellknown manner. The piston-rod is provided with two projecting pins a, as shown, which serve to operate the lever E. Said pins are preferably carried by collars A which are adjustable on the piston, being secured by set-screws a a The valve is mounted in the steam-chest C and is preferablya cylindrical valve. Its rod D passes through astuifing-box c and the opposite end'of said rod preferably rests in a bearing in a standard mounted on the pump-cylinder l3. This valve-rod is preferably formed in'two parts, which are united by a coupling d, so that by loosening the setscrews 8 and taking out the plug 0 the valve can be removed from the valve -chamber without disturbing the stufling-box'and can likewise be-reinserted in the same manner.

The valve-rod D is limited in its movement by the set-collars d and d arranged alongside the standard B It is also provided with other set-collars d and d, between which the lever E operates.

The lever E is mounted on astud-shaft e,

which extends horizontally from the standard E, carried by one of the frame-bars B, and

is adapted to be moved on said pivot by the pins at, extending out from the piston A. The lever is thus operated by said piston to strike the collars ol and d and through said collars operate the valve-rod D and the valve,

being aided by the spring F, as will now be described. The said spring F is secured to some fixed part, as the upper side of the standard B and extends out to a point above the stud-shaft 6, upon which the lever E is mounted. At its free end it carries a V- shaped cam f, which bears upon a suitable surface provided therefor in the upperend of the v lever E, preferably an antifriction-roller e.

The operation of these devices is as follows: All the parts being properly adjusted, one of the pins a on the piston-rod A comes in contact with one side of the lower end of the lever E, preferably when the stroke of. the piston is nearly terminated, and moves said lever somewhat until the upper end comes in contact with one of the collars d (Z and thus starts the valve-rod D. The parts are so adjusted and arranged that just as the rod has thus been started the point of the cam f passes the center of the roller 6' (or corresponding surface on the upper end of the lever) and the force of the spring F is sufficient to impel the lever and valve-rod and valve the remainder of their stroke. The advantage of this is that the valve remains in position without movement during the greater part of the movement of the piston, and when it is moved moves with comparative suddenness from one position to the other, the greater part of its movement being due to the force of the spring sired, as will be readily understood, so that the valve shall operate upon the, -ports to just the desired extent. v

The parts are all simple and inexpensive in the steam-ehest, a valve therein, a valve-rod extending out from said valve, a standard havln g a bearing for said valve-rod, stop collars on said valve-rod, strike collars also on said valve-rod, a pivoted lever adapted to be operated by the pins on the piston and to operate against the strike collars on said valverod, and-a spring havinga cam adapted to come in contact with a suitable surface on said lever, whereby the valve maybe started from the force of the piston and its movement completed by the force of the spring, substantially as and for the purpose set forth.

In witness whereof I have hereunto set m 3' hand and seal, at Lapel, Indiana, this 13th day of March, A. l). 1895.

GEORGE \V. \VRIGII'I. \Vitnesses:

FRANK NELSON, HARVEY KALYA. 

